The plugin is free. For source code contact me.
With this plugin(a web server in fact) you can have control on Winamp from a WebBrowser(player,EQ,playlist).WinAmpWebPlayer1.0 (cool for me) is a General Purpose Winamp Plugin written in Delphi7 using Indy Components. Of couse, as you know, it work only in Winamp 2.x (I used Winamp 2.9).
I was looking for an extern control of Winamp and I didn't find anything that convince me. So, using Indy Component(9.0) from Delphi7 I developed this Winamp GeneralPurpose Plugin. It work like an web server that control Winamp(enought control I hope).